Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm33a1882s&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SM33A-1882
Physics
[2447] Ionosphere / Modeling And Forecasting, [2736] Magnetospheric Physics / Magnetosphere/Ionosphere Interactions, [2753] Magnetospheric Physics / Numerical Modeling
Scientific paper
This paper presents results from a multi-fluid nonlinear model of low-altitude flux tubes. It represents a significant improvement over previously published models, cf. [Sydorenko, Rankin, and Kabin, 2008]. The ionosphere is considered as a finite thickness highly-collisional plasma layer with multiple ion species. Pedersen conductivity is accounted for and motion of electrons and ions inside the ionosphere is omitted. Following [Schunk, 1996], the temperatures of the plasma components are found as a result of a competition between heating and collisional losses. The electron and ion densities are obtained from their continuity equations, with ionization sources and recombination sinks accounted for. The allowance for variation of temperature affects collision frequencies and densities of the plasma components, thus modifying the conductivity. The multi-fluid model is used to study the ionospheric feedback instability [Lysak, 1991]. In this case, the source of heating is the electric current of an Alfven wave and the temperatures, densities, and conductivity are calculated self-consistently. Another application of the model to be discussed is the excitation of Alfven waves by a convection current in the ionosphere, where the ionospheric conductivity changes with time, similar to experiments on artificial heating of the ionosphere. In these simulations, the conductivity profile is a prescribed function of space and time, which in general can be constrained using experimental data on ionospheric heating. Lysak, R. L. (1991), J. Geophys. Res., 96, 1553. Schunk, R. W., (Editor), STEP: Handbook of Ionospheric Models, Utah State Univ., Logan, Utah, 1996. Sydorenko, D., R. Rankin, and K. Kabin (2008), J. Geophys. Res., 113, A10206, doi:10.1029/2008JA013579.
Rankin Robert
Sydorenko D.
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